Getting started with OSGi using a 3D OSGi Robot sample application - Christian Baranowski + Jochen Hiller

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OSGi requires additional expertise from Java developers. During the first OSGi Code Camp (OCC) [1] organized by OSGi Users’ Forum Germany [2], we tried to bring OSGi beginners and experts together, to learn the core concepts and ideas behind OSGi. There will be a 2nd OSGi Code Camp held on 1st of October in Berlin extending the idea of a software craftsmanship training for OSGi beginners and experts. The first part of the talk describes the agile method we used to teach OSGi core concepts by developing an OSGi demo application in pair-programming mode. In the second part of the talk we will explain how we intend to advance the code camp approach by providing a running example - a Robot running on OSGi [3]. The core OSGi concepts will be demonstrated and teached through extensions to the prepared sample application, developed by the Code Camp participants. The extensions are developed in pairs with one OSGi expert and a beginner. The final part of the talk shows the running interactive 3D robot demo application, and explains which OSGi concepts we think should be added during the next code camp. [1] http://germany.osgiusers.org/Main/SummerOCC2010 |2] http://germany.osgiusers.org [3] http://code.google.com/a/eclipselabs.org/p/occ2010/

Technology

Getting started with OSGi
using a 3D OSGi Robot sample application

Christian Baranowski, SEITENBAU GmbH
Jochen Hiller, Deutsche Telekom AG, Products & Innovation
September 20th 2011

Page 1
COPYRIGHT © 2008-2011 OSGi Alliance. All Rights Reserved

What is an OSGi Code Camp?
Experience from the first Camp

Page 4 OSGi Alliance Marketing © 2008-2011 . All Rights Reserved

#1 Agile Design

• Components
• Interaction
• “Post-it”-Design

Page 6 OSGi Alliance Community Event 2011© 2008-2011. All Rights Reserved

#2 Pair Programming

• Pair programming
• OSGi beginners/
experts

Page 7 OSGi Alliance Community Event 2011© 2008-2011. All Rights Reserved

#3 Communication

• Ad-hoc design of
component interaction
• Interfaces agreed
between pairs
• All developers in 1 room!
• Loud!

Page 8 OSGi Alliance Community Event 2011© 2008-2011. All Rights Reserved

#4 Test Driven Development

• Focus on OSGi concepts
• Too much time for
infrastructure setup
• No time for testing!

Page 9 OSGi Alliance Community Event 2011© 2008-2011. All Rights Reserved

#5 Continuous Delivery

• Build server
available
• No one did care
• Late integration

Page 10 OSGi Alliance Community Event 2011© 2008-2011. All Rights Reserved

Summary and Lessons Learned
from the first Camp
We need…
• Development VM
• Cool application
• List of OSGi
concepts to be
implemented

Page 11 OSGi Alliance Community Event 2011© 2008-2011. All Rights Reserved

Live Demo Mars Robot
How to teach OSGi by Example

Page 12 OSGi Alliance Community Event 2011© 2008-2011. All Rights Reserved

Bundle Context API
and Lifecycle
• Simple provisioning

Page 13 OSGi Alliance Community Event 2011© 2008-2011. All Rights Reserved

Separate Interface (Service API)
and Implementation Bundle
• Mars robot API and world implementation bundle

Page 14 OSGi Alliance Community Event 2011© 2008-2011. All Rights Reserved

Whiteboard Pattern

• Simulator desktop bundle adding internal frames

Page 15 OSGi Alliance Community Event 2011© 2008-2011. All Rights Reserved

Extender Pattern
and Bundle Tracker
• Adding static objects to mars world

Page 16 OSGi Alliance Community Event 2011© 2008-2011. All Rights Reserved

Configuration Admin and
Metatype Service
• Creating wall and robot instances

Page 17 OSGi Alliance Community Event 2011© 2008-2011. All Rights Reserved

Event Admin Service

• Integration sensor data view and world (event bus)

Page 18 OSGi Alliance Community Event 2011© 2008-2011. All Rights Reserved

Extending the OSGi Console
(OSGi RFC 147 Draft)
• Robot commands to move and rotate the robot
• Shows how to use OSGi service properties

Page 19 OSGi Alliance Community Event 2011© 2008-2011. All Rights Reserved

OSGi Concepts
Should be added during the next camp
• Simulator by using the Event Admin Service
• Robot web control console with the HTTP Service
• WAR bundles (RFC66) to build a web console
• Remote robot console using OSGi Remote Services
• Service handling e.g. adding other object types to the world (balls)
• with Service Tracker
• using Blueprint components
• Offer sensor and robot data by using Monitor Admin Service
• Add logging with the Log Service
• Preferences Service to persist some user settings (e.g. world size)

Page 20 OSGi Alliance Community Event 2011© 2008-2011. All Rights Reserved

Conclusion

• Mars Robot is a cool application
• OSGi concepts can be demonstrated very easily
• Robot domain nice for running OSGi example
• Extensible in various areas

Mars robot as a “PetStore” for OSGi applications?

Page 21 OSGi Alliance Community Event 2011© 2008-2011. All Rights Reserved

OSGi Code Camp Berlin

• about
20 participants
• VirtualBox VM
• Felix, bndtools

• Hosted at Telekom
Laboratories

Page 22 OSGi Alliance Community Event 2011© 2008-2011. All Rights Reserved

Discusssion and Q&A

Page 23 OSGi Alliance Community Event 2011© 2008-2011. All Rights Reserved

References

• Simbad 3D Robot Simulator
http://simbad.sourceforge.net/
• Richard S. Hall et. al.
OSGi in Action - Creating Modular Applications in Java
• Apache Felix: RFC 147 Overview
http://felix.apache.org/site/apache-felix-gogo.html
• OSGi Code Camp 2010 – Konstanz
http://germany.osgiusers.org/Main/SummerOCC2011
• OSGi Code Camp 2011 – Berlin
• http://germany.osgiusers.org/Main/SummerOCC2010
• bndtools
http://bndtools.org
• Apache Felix Application Demonstration
http://felix.apache.org/site/apache-felix-application-demonstration.html

Page 24 OSGi Alliance Community Event 2011© 2008-2011. All Rights Reserved

OSGi Community Event 2013 (http://www.osgi.org/CommunityEvent2013/Schedule) ABSTRACT There are a number component models available to OSGi developers; Declarative Services (DS), Blueprint (BP), Enterprise JavaBeans (EJB), Contexts and Dependency Injection (CDI). Some have their roots in Java EE, some in open source projects such as the Spring Framework, others are standards at the OSGi Alliance, and some have DNA from all three. As is often the case where there are options available, there's rarely a one-size-fits-all. The 'right' choice may depend on the type of project you're working on, the existing assets, tools and skills at your disposal, and the runtime you're looking to deploy to. This talk will provide a brief overview of the four component models listed, describe their capabilities, standards coverage, tools support, and available implementations, and will show working examples of each, all in an effort to help OSGi users find a path to a component model best suited to their particular task. SPEAKER BIO Graham Charters is a Senior Technical Staff Member in the IBM WebSphere Application Server development organization. He is responsible for the OSGi Applications feature of the Application Server and a committer and PMC member of the Apache Aries OSGi programming model project. He is also the IBM technical lead in the OSGi Alliance Enterprise Expert Group.

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OSGi Feature Model - Where Art Thou - David Bosschaert (Adobe)

mfrancis

OSGi Community Event 2018 Presentation by David Bosschaert (Adobe) Abstract: OSGi lends itself well to develop extensible applications assembled from reusable modules, where a set of bundles together with a set of configurations deployed to a provisioned OSGi framework is the application. While this works very well for the originally intended use-cases, maintaining and building large applications developed by multiple teams often requires to assemble multiple larger components for which there is limited support in OSGi as of today. This is especially true in cases where multiple groups of bundles, configuration, metadata, and other artifacts need to be combined. In this talk we will introduce you to OSGi RFP-188, named OSGi Features, which defines the requirements on providing a solution. We'll establish a shared understanding of the problem space and how it relates to already available mechanisms in OSGi (like e.g. subsystems, deploymentadmin, startlevels, etc.) and will subsequently, review it in the context of some of the current (open source) solutions like Apache Karaf Features and Apache Sling Features and Bnd.

Migrating from PDE to Bndtools in Practice - Amit Kumar Mondal (Deutsche Tele...

mfrancis

OSGi Community Event 2018 Presentation by Amit Kumar Mondal (Deutsche Telekom AG) & Jochen Hiller (Deutsche Telekom AG) Abstract: QIVICON is an Eclipse SmartHome based solution from Deutsche Telekom AG. It utilises OSGi to provide a modular Java runtime. Since the beginning, QIVICON leveraged Eclipse PDE with Maven & Eclipse Tycho as its build technology but over the time, the complexity increased. It became hard to get an overview and manage the runtime and build dependencies. Especially maintaining target configurations for IDE and CI/CD build, having different embedded gateways for installation increased complexity significantly. Bndtools is the 'swiss army knife' in the context of OSGi development since it takes the nitty-gritty pains and loads off the developer's chest. And that's why we decided to avail the benefits of Bndtools. But, many other OSGi-based projects still cannot avail the benefits as they are very tightly coupled with Eclipse PDE. Want to make a switch from your existing PDE source base to Bndtools? This talk would give you an overview to proceed towards this. We would like to further demonstrate in this talk how to set up a Bndtools workspace from an existing PDE workspace, convert all current projects to Bnd projects and embrace the OSGi-way of developing bundles. Since QIVICON containing more than 350 projects utilised this solution to move to a higher modularity maturity level, this talk would, therefore, outline the pros, cons and the learnings using Bndtools in such a big OSGi project for embedded development.

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mfrancis

How OSGi drives cross-sector energy management - Jörn Tümmler (SMA Solar Tech...

mfrancis

OSGi Community Event 2018 Presentation by Jörn Tümmler (SMA Solar Technology) Abstract: SMA is a leading global specialist in photovoltaic system technology with more than 3,000 SMA employees in 20 countries. In 2015 SMA decided to develop the ennexOS platform - a cross-sector platform for holistic, intelligent energy management. An important part of this platform is the data-manager - an IoT gateway that acquires information from various energy generators, storages and loads and performs commissioning and management tasks. This new generation of data-managers demanded for new approaches in software-architecture to: run on a broad range of hardware platforms, and be extendible e.g. to support different protocols for easy integration, and to enable a broad range of applications in the energy-management field that may be customized by apps installed during runtime After an exhaustive investigation on existing solutions, OSGi was chosen as the key technology for this new generation of devices - a quite challenging decision, because at this point there was only limited experience in Java and OSGi development in the company. This talk will present the key factors that lead to this decision, how we very carefully build up Java and OSGi knowledge, and started with an initial design. OSGi enRoute and the support of OSGi experts helped us to accelerate our development and become familiar with OSGi - although we also had times when we were struggling because of the new technology. The talk will demonstrate what we have reached until now and we will tell you if OSGi has kept it's promise ...

Improved developer productivity thanks to Maven and OSGi - Lukasz Dywicki (Co...

mfrancis

OSGi Community Event 2018 Presentation by Lukasz Dywicki (Code-House) Abstract: During this short presentation I will revisit existing mechanisms and approach towards OSGi and JEE development. I will show how many manual steps can be avoided and how to maintain project in effective manner. I will try to find a balance between execution environment requirements and programmer happines at same time. I believe that OSGi and Eclipse ecosystem experience troubles gaining people from outside for few reasons. Beside overall impression of OSGi complexity there is equally old and invalid complain about quaility of developer tooling. Since invention of BND development experience can be really pleasant and independent of text editor/IDE preferences. Sadly lots of people still rely on former experiences spreading black/bad PR. I would like to clarify their point. After this presentation attendees will learn: How to use Maven to build OSGi projects (without Tycho). How to automate manual tasks. How to build custom software distributions with Maven artifacts and run it with Apache Karaf. That OSGi development doesn't differ much from regular day-to-day usage of application servers or microservice runtimes. This talk is intended for people who know basics of OSGi as it will show few basic technics towards better developer productivity.

It Was Twenty Years Ago Today - Building an OSGi based Smart Home System - Ch...

mfrancis

OSGi Community Event 2018 Presentation by Christer Larsson (Makewave) Abstract: OSGi was originally designed for Smart Homes and Residential Gateways almost 20 years ago. This talk will present how the OSGi specifications have evolved over the years, and how you today, in 2018, design an OSGi based Smart Home System. A real world use case of a Swedish Smart Home start-up company will be used to illustrate different design principles and how OSGi remains as relevant today as it was when it started.

Popular patterns revisited on OSGi - Christian Schneider (Adobe)

mfrancis

OSGi Community Event 2018 Presentation by Christian Schneider (Adobe) Abstract: We will look at common cloud and design patterns and see how the special properties of the OSGi environment allows us to rethink these patterns. The talk shows some well known patterns like the service registry and the whiteboard but also some unique patterns like out of band circuit breaker or graceful degregation. The patterns are shown with some examples using declarative services(DS). So some basic OSGi and DS knowledge is of advantage but not required. For OSGi beginners the well established OSGi patterns will help getting started the right way. Experienced OSGi developers will find some new patterns to think about. Cloud or enterprise developers will get a new approach to some patterns they are used to which hopefully inspires them to take another look at the current state of OSGi.

Integrating SLF4J and the new OSGi LogService 1.4 - BJ Hargrave (IBM)

mfrancis

OSGi Community Event 2018 Presentation by BJ Hargrave (IBM) Abstract: OSGi Compendium R7 provides a major update to the OSGi LogService specification. A new logging API is added which supports logging levels and dynamic logging administration. A new Push Stream-based means of receiving log entries is also added. But it is quite often the case you need to use other code such as open source projects which are using slf4j for their logging API. This session will explore the new OSGi LogService changes and how you can integrate code using both slf4j logging and OSGi LogService logging.

OSG(a)i: because AI needs a runtime - Tim Verbelen (imec)

mfrancis

OSGi Community Event 2018 Presentation by Tim Verbelen (imec) Abstract: Nowadays AI is reaching new heights on the hype cycle, especially due to recent advances in deep learning techniques. A lot of deep learning frameworks exist for creating and training deep neural networks, the most popular ones being PyTorch and TensorFlow. However, how to integrate, deploy and manage these neural networks in complex software systems is often overlooked. In this talk we show how OSGi can be used as a modular runtime for deep learning models. We embed those models inside OSGi bundles, and use the extender pattern to make these available as OSGi services. You can then use your favorite OSGi specs such as DS and PushStreams to integrate these into your application.

Flying to Jupiter with OSGi - Tony Walsh (ESA) & Hristo Indzhov (Telespazio V...

mfrancis

OSGi Community Event 2018 Presentation by Tony Walsh (ESA) & Hristo Indzhov (Telespazio Vega) Abstract: The European Space Operations Centre (ESOC) is the main operations center for the European Space Agency (ESA), operating a number of earth observation and scientific missions. Monitoring and control functions needed by spacecraft operators are provided by software systems which are reused across missions, but tailored and extended for mission specific needs. The current generation of monitoring and control systems are becoming obsolete and a European wide initiative called the European Ground Systems Common Core (EGS-CC) (http://www.egscc.esa.int) has been started to develop the next generation. This talk will explain why OSGi was chosen and how it is used in the development of next generation of monitoring and control software. It will describe how OSGi provides the necessary framework that enables the software to be extended for the different space systems it is expected to support. The overall software architecture will be discussed, some of the challenges faced and the benefits gained by using OSGi. The first target mission for the system is JUICE (http://sci.esa.int/juice) which will explore the moons of Jupiter and which is scheduled for launch in 2022.

MicroProfile, OSGi was meant for this - Ray Auge (Liferay)

mfrancis

OSGi Community Event 2018 Presentation by Ray Augé (Liferay) Abstract: The craze is fully on. The past couple of years have seem micro services grow from next _flava_ to fully consuming of the software industry. The Eclipse micorprofile.io project is tackling the issue putting common usage patterns together over a foundation of CDI. What better assembly driver is there than OSGi to put it all together. This talk will demonstrate building your own MicroProfile using OSGi and the OSGi enRoute packaging model.

Prototyping IoT systems with a hybrid OSGi & Node-RED platform - Bruce Jackso...

mfrancis

OSGi Community Event 2018 Presentation by Bruce Jackson (Myriad) Abstract: Node-RED is often used as a protyping tool for IoT systems. However, there are also a large number of OSGi components that have already been built to interface to devices, sensors and systems. In this talk I will show how two completely different runtime environments (OSGi and Node-RED) can be combined into a single platform for prototyping (and more) combining the strengths of both languages and systems. Being able to quickly and simply prototype IoT application is extremely useful, and to this end many people have adopted Node-Red, a Node.js based runtime with extensive support for plugins to interface to various IoT hardware and protocols. However, this requires these services/protocols to be developed in Javascript, and there is already a significant body of code developed in Java/OSGi that it would be desirable to re-use. The talk will explain how it is possible to: Create and manage a Node-Red runtime from within an OSGi bundle  Share OSGi components and object into the Node-Red runtime  Interact and build Node-Red flows that exchange data and call methods between Node.js and OSGi This is obviously useful for the original purpose: prototyping IoT systems, but also demonstrates some interesting techniques for bridging between different languages and runtimes.

How to connect your OSGi application - Dirk Fauth (Bosch)

mfrancis

OSGi Community Event 2018 Presentation by Dirk Fauth (Bosch) Abstract: In todays connected world the requirement to connect applications across network boundaries has become a common requirement. With OSGi there are several ways to accomplish this, as there are different specifications to achieve this. In this talk we will look at some of these specifications to show what options there are and which might fit your requirements. Starting from an architecture that makes use of the HTTP Whiteboard pattern, over Remote Services to finally showing the usage of the JAX-RS Whiteboard specification introduced with R7. We will show the general usage of these specifications and explaining the advantages and disadvantages of each solution.

Visualization of OSGi based Software Architectures in Virtual Reality - Lisa ...

mfrancis

OSGi Community Event 2018 Presentation by Lisa Nafeie (DLR) Abstract: Classic software architecture visualizations such as UML diagrams are widely used in practice but are not always the best solution, for example to get an high level overview of large component-based software systems. In this talk, we show other suitable technologies for software visualization to understand complex software architectures. Especially, we show how to visualize OSGi based software architectures in Virtual Reality (VR) using VR headsets. We address the question, how software visualizing can help during the development process and what are the resulting benefits for developers and software testers. We focus on four aspects: Development, evaluation, quality assurance, and visualization technology. We demonstrate software visualization using the software ”IslandViz”, which visualizes OSGi based software systems using an island metaphor, where islands on a virtual water level represents OSGi bundles, regions on the islands represents packages, and buildings represents classes. We describe how to get all relevant data for the visualization by repository mining on the whole source tree and data mining on source code level. We store all data in a graph database for further analysis and visualization. Through software visualization we were able to answer many important questions, which have already taken a lot of time in development and test-phases. In addition, it’s very important to make the software architecture tangible, which makes it easier way to talk about technical problems in teams formed by people with different knowledge, communications skills, and backgrounds.

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How OSGi drives cross-sector energy management - Jörn Tümmler (SMA Solar Tech...

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1. Getting started with OSGi using a 3D OSGi Robot sample application Christian Baranowski, SEITENBAU GmbH Jochen Hiller, Deutsche Telekom AG, Products & Innovation September 20th 2011 Page 1 COPYRIGHT © 2008-2011 OSGi Alliance. All Rights Reserved

5. #3 Communication • Ad-hoc design of component interaction • Interfaces agreed between pairs • All developers in 1 room! • Loud! Page 8 OSGi Alliance Community Event 2011© 2008-2011. All Rights Reserved

8. Summary and Lessons Learned from the first Camp We need… • Development VM • Cool application • List of OSGi concepts to be implemented Page 11 OSGi Alliance Community Event 2011© 2008-2011. All Rights Reserved

16. Extending the OSGi Console (OSGi RFC 147 Draft) • Robot commands to move and rotate the robot • Shows how to use OSGi service properties Page 19 OSGi Alliance Community Event 2011© 2008-2011. All Rights Reserved

17. OSGi Concepts Should be added during the next camp • Simulator by using the Event Admin Service • Robot web control console with the HTTP Service • WAR bundles (RFC66) to build a web console • Remote robot console using OSGi Remote Services • Service handling e.g. adding other object types to the world (balls) • with Service Tracker • using Blueprint components • Offer sensor and robot data by using Monitor Admin Service • Add logging with the Log Service • Preferences Service to persist some user settings (e.g. world size) Page 20 OSGi Alliance Community Event 2011© 2008-2011. All Rights Reserved

18. Conclusion • Mars Robot is a cool application • OSGi concepts can be demonstrated very easily • Robot domain nice for running OSGi example • Extensible in various areas Mars robot as a “PetStore” for OSGi applications? Page 21 OSGi Alliance Community Event 2011© 2008-2011. All Rights Reserved

21. References • Simbad 3D Robot Simulator http://simbad.sourceforge.net/ • Richard S. Hall et. al. OSGi in Action - Creating Modular Applications in Java • Apache Felix: RFC 147 Overview http://felix.apache.org/site/apache-felix-gogo.html • OSGi Code Camp 2010 – Konstanz http://germany.osgiusers.org/Main/SummerOCC2011 • OSGi Code Camp 2011 – Berlin • http://germany.osgiusers.org/Main/SummerOCC2010 • bndtools http://bndtools.org • Apache Felix Application Demonstration http://felix.apache.org/site/apache-felix-application-demonstration.html Page 24 OSGi Alliance Community Event 2011© 2008-2011. All Rights Reserved

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